//-----------------------------------------------------------------------------
// Copyright (C) Merlok - 2017
// iceman 2018
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Command: hf mf list. It shows data from arm buffer.
//-----------------------------------------------------------------------------

#include "cmdhflist.h"

enum MifareAuthSeq {
	masNone,
	masNt,
	masNrAr,
	masAt,
	masAuthComplete,
	masFirstData,
	masData,
	masError,
};
static enum MifareAuthSeq MifareAuthState;
static TAuthData AuthData;

void ClearAuthData() {
	AuthData.uid = 0;
	AuthData.nt = 0;
	AuthData.first_auth = true;
	AuthData.ks2 = 0;
	AuthData.ks3 = 0;
}

/**
 * @brief iso14443A_CRC_check Checks CRC in command or response
 * @param isResponse
 * @param data
 * @param len
 * @return  0 : CRC-command, CRC not ok
 *          1 : CRC-command, CRC ok
 *          2 : Not crc-command
 */

uint8_t iso14443A_CRC_check(bool isResponse, uint8_t* d, uint8_t n) {
	if (n < 3) return 2;
	if (isResponse & (n < 6)) return 2;
	return check_crc(CRC_14443_A, d, n);
}

uint8_t mifare_CRC_check(bool isResponse, uint8_t* data, uint8_t len) {
	switch(MifareAuthState) {
		case masNone:
		case masError:
			return iso14443A_CRC_check(isResponse, data, len);
		default:
			return 2;
	}
}

/**
 * @brief iso14443B_CRC_check Checks CRC
 * @param data
 * @param len
 * @return  0 : CRC-command, CRC not ok
 *          1 : CRC-command, CRC ok
 *          2 : Not crc-command
 */
uint8_t iso14443B_CRC_check(uint8_t* d, uint8_t n) {
	return check_crc(CRC_14443_B, d, n);
}

uint8_t iso15693_CRC_check(uint8_t* d, uint8_t n) {
	return check_crc(CRC_15693, d, n);
}

/**
 * @brief iclass_CRC_Ok Checks CRC in command or response
 * @param isResponse
 * @param data
 * @param len
 * @return  0 : CRC-command, CRC not ok
 *	        1 : CRC-command, CRC ok
 *          2 : Not crc-command
 */
uint8_t iclass_CRC_check(bool isResponse, uint8_t* d, uint8_t n) {
	//CRC commands (and responses) are all at least 4 bytes
	if (n < 4) return 2;

	//Commands to tag
	//Don't include the command byte
	if (!isResponse) {
		/**
		  These commands should have CRC. Total length leftmost
		  4	READ
		  4 READ4
		  12 UPDATE - unsecured, ends with CRC16
		  14 UPDATE - secured, ends with signature instead
		  4 PAGESEL
		  **/
		//Covers three of them
		if (n == 4 || n == 12) {
			return check_crc( CRC_ICLASS, d+1, n-1);
		}
		return 2;
	} 
	/**
	These tag responses should have CRC. Total length leftmost

	10  READ		data[8] crc[2]
	34  READ4		data[32]crc[2]
	10  UPDATE	data[8] crc[2]
	10 SELECT	csn[8] crc[2]
	10  IDENTIFY  asnb[8] crc[2]
	10  PAGESEL   block1[8] crc[2]
	10  DETECT    csn[8] crc[2]

	These should not

	4  CHECK		chip_response[4]
	8  READCHECK data[8]
	1  ACTALL    sof[1]
	1  ACT	     sof[1]

	In conclusion, without looking at the command; any response
	of length 10 or 34 should have CRC
	  **/
	if (n != 10 && n != 34) return true;

	return check_crc( CRC_ICLASS, d, n);
}

int applyIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize) {
	switch ( cmd[0] ){
		case ISO14443A_CMD_WUPA:        snprintf(exp,size,"WUPA"); break;
		case ISO14443A_CMD_ANTICOLL_OR_SELECT:{
			// 93 20 = Anticollision (usage: 9320 - answer: 4bytes UID+1byte UID-bytes-xor)
			// 93 70 = Select (usage: 9370+5bytes 9320 answer - answer: 1byte SAK)
			if(cmd[1] == 0x70)
				snprintf(exp,size,"SELECT_UID");
			else
				snprintf(exp,size,"ANTICOLL");
			break;
		}
		case ISO14443A_CMD_ANTICOLL_OR_SELECT_2:{
			//95 20 = Anticollision of cascade level2
			//95 70 = Select of cascade level2
			if(cmd[2] == 0x70)
				snprintf(exp,size,"SELECT_UID-2");
			else
				snprintf(exp,size,"ANTICOLL-2");
			break;
		}
		case ISO14443A_CMD_REQA:		snprintf(exp,size,"REQA"); break;
		case ISO14443A_CMD_READBLOCK:	snprintf(exp,size,"READBLOCK(%d)",cmd[1]); break;
		case ISO14443A_CMD_WRITEBLOCK:	snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]); break;
		case ISO14443A_CMD_HALT:		
			snprintf(exp,size,"HALT"); 
			MifareAuthState = masNone;
			break;
		case ISO14443A_CMD_RATS:		snprintf(exp,size,"RATS"); break;
		case MIFARE_CMD_INC:			snprintf(exp,size,"INC(%d)",cmd[1]); break;
		case MIFARE_CMD_DEC:			snprintf(exp,size,"DEC(%d)",cmd[1]); break;
		case MIFARE_CMD_RESTORE:		snprintf(exp,size,"RESTORE(%d)",cmd[1]); break;
		case MIFARE_CMD_TRANSFER:		snprintf(exp,size,"TRANSFER(%d)",cmd[1]); break;
		case MIFARE_AUTH_KEYA:{
			if ( cmdsize > 3) {
				snprintf(exp,size,"AUTH-A(%d)",cmd[1]);
				MifareAuthState = masNt;
			} else {
				//	case MIFARE_ULEV1_VERSION :  both 0x60.
				snprintf(exp,size,"EV1 VERSION");
			}
			break;
		}
		case MIFARE_AUTH_KEYB: {
			MifareAuthState = masNt;
			snprintf(exp,size,"AUTH-B(%d)",cmd[1]); 
			break;
		}
		case MIFARE_MAGICWUPC1:			snprintf(exp,size,"MAGIC WUPC1"); break;
		case MIFARE_MAGICWUPC2:			snprintf(exp,size,"MAGIC WUPC2"); break;
		case MIFARE_MAGICWIPEC:			snprintf(exp,size,"MAGIC WIPEC"); break;
		case MIFARE_ULC_AUTH_1 :		snprintf(exp,size,"AUTH "); break;
		case MIFARE_ULC_AUTH_2 : 		snprintf(exp,size,"AUTH_ANSW"); break;
		case MIFARE_ULEV1_AUTH :	
			if ( cmdsize == 7 )
				snprintf(exp,size,"PWD-AUTH KEY: 0x%02x%02x%02x%02x", cmd[1], cmd[2], cmd[3], cmd[4] );
			else
				snprintf(exp,size,"PWD-AUTH");
			break;
		case MIFARE_ULEV1_FASTREAD : {
			if ( cmdsize >=3 && cmd[2] <= 0xE6)
				snprintf(exp,size,"READ RANGE (%d-%d)",cmd[1],cmd[2]); 
			else
				// outside limits, useful for some tags...
				snprintf(exp,size,"READ RANGE (%d-%d) (?)",cmd[1], cmd[2]); 
			break;
		}
		case MIFARE_ULC_WRITE : {
			if ( cmd[1] < 0x21 )
				snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]); 
			else
				// outside limits, useful for some tags...				
				snprintf(exp, size, "WRITEBLOCK(%d) (?)", cmd[1]); 
			break;
		}
		case MIFARE_ULEV1_READ_CNT :{
			if ( cmd[1] < 5 )
				snprintf(exp,size,"READ CNT(%d)",cmd[1]);
			else
				snprintf(exp,size,"?");
			break;
		}
		case MIFARE_ULEV1_INCR_CNT : {
			if ( cmd[1] < 5 )
				snprintf(exp,size,"INCR(%d)",cmd[1]);
			else
				snprintf(exp,size,"?");
			break;
		}
		case MIFARE_ULEV1_READSIG :		snprintf(exp,size,"READ_SIG"); break;
		case MIFARE_ULEV1_CHECKTEAR : 	snprintf(exp,size,"CHK_TEARING(%d)",cmd[1]); break;
		case MIFARE_ULEV1_VCSL :		snprintf(exp,size,"VCSL"); break;
		default:						return 0;
	}
	return 1;
}

void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize) {
	applyIso14443a(exp, size, cmd, cmdsize);
}

void annotateIclass(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize) {
	switch (cmd[0]) {
		case ICLASS_CMD_ACTALL:      snprintf(exp,size,"ACTALL"); break;
		case ICLASS_CMD_READ_OR_IDENTIFY:{
			if(cmdsize > 1){
				snprintf(exp,size,"READ(%d)",cmd[1]);
			}else{
				snprintf(exp,size,"IDENTIFY");
			}
			break;
		}
		case ICLASS_CMD_SELECT:      snprintf(exp,size,"SELECT"); break;
		case ICLASS_CMD_PAGESEL:     snprintf(exp,size,"PAGESEL(%d)", cmd[1]); break;
		case ICLASS_CMD_READCHECK_KC:snprintf(exp,size,"READCHECK[Kc](%d)", cmd[1]); break;
		case ICLASS_CMD_READCHECK_KD:snprintf(exp,size,"READCHECK[Kd](%d)", cmd[1]); break;
		case ICLASS_CMD_CHECK:       snprintf(exp,size,"CHECK"); break;
		case ICLASS_CMD_DETECT:      snprintf(exp,size,"DETECT"); break;
		case ICLASS_CMD_HALT:        snprintf(exp,size,"HALT"); break;
		case ICLASS_CMD_UPDATE:      snprintf(exp,size,"UPDATE(%d)",cmd[1]); break;
		case ICLASS_CMD_ACT:         snprintf(exp,size,"ACT"); break;
		case ICLASS_CMD_READ4:       snprintf(exp,size,"READ4(%d)",cmd[1]); break;
		default:                     snprintf(exp,size,"?"); break;
	}
	return;
}

void annotateIso15693(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize) {

	switch(cmd[1]){
		case ISO15693_INVENTORY				:snprintf(exp, size, "INVENTORY");return;
		case ISO15693_STAYQUIET				:snprintf(exp, size, "STAY_QUIET");return;
		case ISO15693_READBLOCK				:snprintf(exp, size, "READBLOCK");return;
		case ISO15693_WRITEBLOCK			:snprintf(exp, size, "WRITEBLOCK");return;
		case ISO15693_LOCKBLOCK				:snprintf(exp, size, "LOCKBLOCK");return;
		case ISO15693_READ_MULTI_BLOCK		:snprintf(exp, size, "READ_MULTI_BLOCK");return;
		case ISO15693_SELECT				:snprintf(exp, size, "SELECT");return;
		case ISO15693_RESET_TO_READY		:snprintf(exp, size, "RESET_TO_READY");return;
		case ISO15693_WRITE_AFI				:snprintf(exp, size, "WRITE_AFI");return;
		case ISO15693_LOCK_AFI				:snprintf(exp, size, "LOCK_AFI");return;
		case ISO15693_WRITE_DSFID			:snprintf(exp, size, "WRITE_DSFID");return;
		case ISO15693_LOCK_DSFID			:snprintf(exp, size, "LOCK_DSFID");return;
		case ISO15693_GET_SYSTEM_INFO		:snprintf(exp, size, "GET_SYSTEM_INFO");return;
		case ISO15693_READ_MULTI_SECSTATUS	:snprintf(exp, size, "READ_MULTI_SECSTATUS");return;
		default: break;
	}

	if ( cmd[1] >= 0x2D && cmd[1] <= 0x9F ) snprintf(exp, size, "Optional RFU"); 
	else if ( cmd[1] >= 0xA0 && cmd[1] <= 0xDF ) snprintf(exp, size, "Cust IC MFG dependent"); 
	else if ( cmd[1] >= 0xE0 && cmd[1] <= 0xFF ) snprintf(exp, size, "Proprietary IC MFG dependent"); 
	else
		snprintf(exp, size, "?");
}

void annotateTopaz(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize){
	switch(cmd[0]) {
		case TOPAZ_REQA						:snprintf(exp, size, "REQA");break;
		case TOPAZ_WUPA						:snprintf(exp, size, "WUPA");break;
		case TOPAZ_RID						:snprintf(exp, size, "RID");break;
		case TOPAZ_RALL						:snprintf(exp, size, "RALL");break;
		case TOPAZ_READ						:snprintf(exp, size, "READ");break;
		case TOPAZ_WRITE_E					:snprintf(exp, size, "WRITE-E");break;
		case TOPAZ_WRITE_NE					:snprintf(exp, size, "WRITE-NE");break;
		case TOPAZ_RSEG						:snprintf(exp, size, "RSEG");break;
		case TOPAZ_READ8					:snprintf(exp, size, "READ8");break;
		case TOPAZ_WRITE_E8					:snprintf(exp, size, "WRITE-E8");break;
		case TOPAZ_WRITE_NE8				:snprintf(exp, size, "WRITE-NE8");break;
		default								:snprintf(exp,size,"?"); break;
	}
}

// iso 7816-3 
void annotateIso7816(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize){
	// S-block
	if ( (cmd[0] & 0xC0) && (cmdsize == 3) ) {		
		switch ( (cmd[0] & 0x3f)  ) {
			case 0x00 	: snprintf(exp, size, "S-block RESYNCH req"); break;
			case 0x20 	: snprintf(exp, size, "S-block RESYNCH resp"); break;
			case 0x01 	: snprintf(exp, size, "S-block IFS req"); break;
			case 0x21 	: snprintf(exp, size, "S-block IFS resp"); break;
			case 0x02	: snprintf(exp, size, "S-block ABORT req"); break;
			case 0x22	: snprintf(exp, size, "S-block ABORT resp"); break;
			case 0x03	: snprintf(exp, size, "S-block WTX reqt"); break;
			case 0x23	: snprintf(exp, size, "S-block WTX resp"); break;
			default		: snprintf(exp, size, "S-block"); break;
		}		
	}
	// R-block (ack)
	else if ( ((cmd[0] & 0xD0) == 0x80) && ( cmdsize > 2) ) {
		if ( (cmd[0] & 0x10) == 0 ) 
			snprintf(exp, size, "R-block ACK");
		else
			snprintf(exp, size, "R-block NACK");
	}
	// I-block
	else {

		int pos = (cmd[0] == 2 ||  cmd[0] == 3) ? 2 : 3;
		switch ( cmd[pos] ){
			case ISO7816_READ_BINARY				:snprintf(exp, size, "READ BIN");break;
			case ISO7816_WRITE_BINARY				:snprintf(exp, size, "WRITE BIN");break;
			case ISO7816_UPDATE_BINARY				:snprintf(exp, size, "UPDATE BIN");break;
			case ISO7816_ERASE_BINARY				:snprintf(exp, size, "ERASE BIN");break;
			case ISO7816_READ_RECORDS				:snprintf(exp, size, "READ RECORDS");break;
			case ISO7816_WRITE_RECORDS				:snprintf(exp, size, "WRITE RECORDS");break;
			case ISO7816_APPEND_RECORD				:snprintf(exp, size, "APPEND RECORD");break;
			case ISO7816_UPDATE_RECORD				:snprintf(exp, size, "UPDATE RECORD");break;
			case ISO7816_GET_DATA					:snprintf(exp, size, "GET DATA");break;
			case ISO7816_PUT_DATA					:snprintf(exp, size, "PUT DATA");break;
			case ISO7816_SELECT_FILE				:snprintf(exp, size, "SELECT FILE");break;
			case ISO7816_VERIFY						:snprintf(exp, size, "VERIFY");break;
			case ISO7816_INTERNAL_AUTHENTICATION 	:snprintf(exp, size, "INTERNAL AUTH");break;
			case ISO7816_EXTERNAL_AUTHENTICATION 	:snprintf(exp, size, "EXTERNAL AUTH");break;
			case ISO7816_GET_CHALLENGE				:snprintf(exp, size, "GET CHALLENGE");break;
			case ISO7816_MANAGE_CHANNEL				:snprintf(exp, size, "MANAGE CHANNEL");break;
			default									:snprintf(exp,size,"?"); break;
		}
	}
}

// MIFARE DESFire
void annotateMfDesfire(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize){
	
	// it's basically a ISO14443a tag, so try annotation from there
	if (!applyIso14443a(exp, size, cmd, cmdsize)){
		// S-block 11xxx010
		if ( (cmd[0] & 0xC0) && (cmdsize == 3) ) {		
			switch ( (cmd[0] & 0x30)  ) {
				case 0x30	: snprintf(exp, size, "S-block DESELECT"); break;
				case 0x00	: snprintf(exp, size, "S-block WTX"); break;
				default		: snprintf(exp, size, "S-block"); break;
			}		
		}
		// R-block (ack) 101xx01x
		else if ( ((cmd[0] & 0xB0) == 0xA0) && ( cmdsize > 2) ) {
			if ( (cmd[0] & 0x10) == 0 ) 
				snprintf(exp, size, "R-block ACK(%d)", (cmd[0] & 0x01));
			else
				snprintf(exp, size, "R-block NACK(%d)", (cmd[0] & 0x01));
		}
		// I-block 000xCN1x
		else if ( (cmd[0] & 0xC0) == 0x00){
			// PCB [CID] [NAD] [INF] CRC CRC
			int pos = 1;
			if ( (cmd[0] & 0x08) == 0x08) // cid byte following
				pos = pos + 1;
			if ( (cmd[0] & 0x04) == 0x04) // nad byte following
				pos = pos + 1;
			switch ( cmd[pos] ){
				case MFDES_CREATE_APPLICATION			:snprintf(exp, size, "CREATE APPLICATION");break;
				case MFDES_DELETE_APPLICATION			:snprintf(exp, size, "DELETE APPLICATION");break;
				case MFDES_GET_APPLICATION_IDS			:snprintf(exp, size, "GET APPLICATION IDS");break;
				case MFDES_SELECT_APPLICATION			:snprintf(exp, size, "SELECT APPLICATION");break;
				case MFDES_FORMAT_PICC					:snprintf(exp, size, "FORMAT PICC");break;
				case MFDES_GET_VERSION					:snprintf(exp, size, "GET VERSION");break;
				case MFDES_READ_DATA					:snprintf(exp, size, "READ DATA");break;
				case MFDES_WRITE_DATA					:snprintf(exp, size, "WRITE DATA");break;
				case MFDES_GET_VALUE					:snprintf(exp, size, "GET VALUE");break;
				case MFDES_CREDIT						:snprintf(exp, size, "CREDIT");break;
				case MFDES_DEBIT						:snprintf(exp, size, "DEBIT");break;
				case MFDES_LIMITED_CREDIT				:snprintf(exp, size, "LIMITED CREDIT");break;
				case MFDES_WRITE_RECORD					:snprintf(exp, size, "WRITE RECORD");break;
				case MFDES_READ_RECORDS					:snprintf(exp, size, "READ RECORDS");break;
				case MFDES_CLEAR_RECORD_FILE			:snprintf(exp, size, "CLEAR RECORD FILE");break;
				case MFDES_COMMIT_TRANSACTION			:snprintf(exp, size, "COMMIT TRANSACTION");break;
				case MFDES_ABORT_TRANSACTION			:snprintf(exp, size, "ABORT TRANSACTION");break;
				case MFDES_GET_FREE_MEMORY				:snprintf(exp, size, "GET FREE MEMORY");break;
				case MFDES_GET_FILE_IDS					:snprintf(exp, size, "GET FILE IDS");break;
				case MFDES_GET_ISOFILE_IDS				:snprintf(exp, size, "GET ISOFILE IDS");break;
				case MFDES_GET_FILE_SETTINGS			:snprintf(exp, size, "GET FILE SETTINGS");break;
				case MFDES_CHANGE_FILE_SETTINGS			:snprintf(exp, size, "CHANGE FILE SETTINGS");break;
				case MFDES_CREATE_STD_DATA_FILE			:snprintf(exp, size, "CREATE STD DATA FILE");break;
				case MFDES_CREATE_BACKUP_DATA_FILE		:snprintf(exp, size, "CREATE BACKUP DATA FILE");break;
				case MFDES_CREATE_VALUE_FILE			:snprintf(exp, size, "CREATE VALUE FILE");break;
				case MFDES_CREATE_LINEAR_RECORD_FILE	:snprintf(exp, size, "CREATE LINEAR RECORD FILE");break;
				case MFDES_CREATE_CYCLIC_RECORD_FILE	:snprintf(exp, size, "CREATE CYCLIC RECORD FILE");break;
				case MFDES_DELETE_FILE					:snprintf(exp, size, "DELETE FILE");break;
				case MFDES_AUTHENTICATE					:snprintf(exp, size, "AUTH NATIVE (keyNo %d)", cmd[pos+1]);break;  // AUTHENTICATE_NATIVE
				case MFDES_AUTHENTICATE_ISO				:snprintf(exp, size, "AUTH ISO (keyNo %d)", cmd[pos+1]);break;  // AUTHENTICATE_STANDARD
				case MFDES_AUTHENTICATE_AES				:snprintf(exp, size, "AUTH AES (keyNo %d)", cmd[pos+1]);break;
				case MFDES_CHANGE_KEY_SETTINGS			:snprintf(exp, size, "CHANGE KEY SETTINGS");break;
				case MFDES_GET_KEY_SETTINGS				:snprintf(exp, size, "GET KEY SETTINGS");break;
				case MFDES_CHANGE_KEY					:snprintf(exp, size, "CHANGE KEY");break;
				case MFDES_GET_KEY_VERSION				:snprintf(exp, size, "GET KEY VERSION");break;
				case MFDES_AUTHENTICATION_FRAME			:snprintf(exp, size, "AUTH FRAME / NEXT FRAME");break;
				default									:break;
			}
		}else{
			// anything else
			snprintf(exp,size,"?");
		}
	}
}

/**
06 00 = INITIATE
0E xx = SELECT ID (xx = Chip-ID)
0B = Get UID
08 yy = Read Block (yy = block number)
09 yy dd dd dd dd = Write Block (yy = block number; dd dd dd dd = data to be written)
0C = Reset to Inventory
0F = Completion
0A 11 22 33 44 55 66 = Authenticate (11 22 33 44 55 66 = data to authenticate)
**/
void annotateIso14443b(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize) {
	switch(cmd[0]){
		case ISO14443B_REQB   		: {
			
			switch ( cmd[2] & 0x07 ) {
				case 0: snprintf(exp, size,"1 slot ");break;
				case 1: snprintf(exp, size,"2 slots ");break; 
				case 2: snprintf(exp, size,"4 slots ");break;
				case 3: snprintf(exp, size,"8 slots ");break;
				default: snprintf(exp, size,"16 slots ");break;
			}			
			if ( (cmd[2] & 0x8) )
				snprintf(exp, size,"WUPB");
			else
				snprintf(exp, size,"REQB");
			break;
		}
		case ISO14443B_ATTRIB 		: snprintf(exp,size,"ATTRIB");break;
		case ISO14443B_HALT   		: snprintf(exp,size,"HALT");break;
		case ISO14443B_INITIATE     : snprintf(exp,size,"INITIATE");break;
		case ISO14443B_SELECT       : snprintf(exp,size,"SELECT(%d)",cmd[1]);break;
		case ISO14443B_GET_UID      : snprintf(exp,size,"GET UID");break;
		case ISO14443B_READ_BLK     : snprintf(exp,size,"READ_BLK(%d)", cmd[1]);break;
		case ISO14443B_WRITE_BLK    : snprintf(exp,size,"WRITE_BLK(%d)",cmd[1]);break;
		case ISO14443B_RESET        : snprintf(exp,size,"RESET");break;
		case ISO14443B_COMPLETION   : snprintf(exp,size,"COMPLETION");break;
		case ISO14443B_AUTHENTICATE : snprintf(exp,size,"AUTHENTICATE");break;
		case ISO14443B_PING			: snprintf(exp,size,"PING");break;
		case ISO14443B_PONG			: snprintf(exp,size,"PONG");break;
		default                     : snprintf(exp,size ,"?");break;
	}
}

// LEGIC 
// 1 = read
// 0 = write
// Quite simpel tag
void annotateLegic(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize){	
	uint8_t bitsend = cmd[0];	
	uint8_t cmdBit = (cmd[1] & 1);
	switch (bitsend){
		case 7:
			snprintf(exp, size, "IV 0x%02X", cmd[1]);
			break;
		case 6: {
			switch ( cmd[1] ) {
				case LEGIC_MIM_22:	 snprintf(exp, size, "MIM22"); break;
				case LEGIC_MIM_256:	 snprintf(exp, size, "MIM256"); break;
				case LEGIC_MIM_1024: snprintf(exp, size, "MIM1024"); break;
				case LEGIC_ACK_22:	 snprintf(exp, size, "ACK 22"); break;
				case LEGIC_ACK_256:	 snprintf(exp, size, "ACK 256/1024"); break;
			}
			break;
		}
		case 9:
		case 11: {

			uint16_t address = (cmd[2] << 7) | cmd[1] >> 1;
			
			if (cmdBit == LEGIC_READ) 
				snprintf(exp, size, "READ Byte(%d)", address);
			
			if (cmdBit == LEGIC_WRITE ) 
				snprintf(exp, size, "WRITE Byte(%d)", address);
			break;
		}
		case 21: {
			if (cmdBit == LEGIC_WRITE ) {
				uint16_t address = ((cmd[2] << 7) | cmd[1] >> 1) & 0xFF;
				uint8_t val = (cmd[3] & 1 ) << 7 | cmd[2] >> 1;
				snprintf(exp, size, "WRITE Byte(%d) %02X", address, val);
			}
			break;
		}
		case 23: {
			if (cmdBit == LEGIC_WRITE ) {
				uint16_t address = ((cmd[2] << 7) | cmd[1] >> 1) & 0x3FF;
				uint8_t val = (cmd[3] & 0x7 ) << 5 | cmd[2] >> 3;
				snprintf(exp, size, "WRITE Byte(%d) %02X", address, val);
			}
			break;
		}
		case 12:
		default:
			break;
	}
}

void annotateFelica(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize){	
	switch(cmd[0]){
		default                     : snprintf(exp,size ,"?");break;
	}
}

void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
	if (!isResponse && cmdsize == 1) {
		switch(cmd[0]) {
			case ISO14443A_CMD_WUPA:        
			case ISO14443A_CMD_REQA:		
				MifareAuthState = masNone;
				break;
			default:
				break;
		}
	}
	
	// get UID
	if (MifareAuthState == masNone) {
		if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
			ClearAuthData();
			AuthData.uid = bytes_to_num(&cmd[2], 4);
		}
		if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && cmd[1] == 0x70) {
			ClearAuthData();
			AuthData.uid = bytes_to_num(&cmd[2], 4);
		}
		if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_3 && cmd[1] == 0x70) {
			ClearAuthData();
			AuthData.uid = bytes_to_num(&cmd[2], 4);
		}
	}
	
	switch(MifareAuthState) {
		case masNt:
			if (cmdsize == 4 && isResponse) {
				snprintf(exp, size, "AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
				MifareAuthState = masNrAr;
				if (AuthData.first_auth) {
					AuthData.nt = bytes_to_num(cmd, 4);
				} else {
					AuthData.nt_enc = bytes_to_num(cmd, 4);
					AuthData.nt_enc_par = parity[0];
				}
				return;
			} else {
				MifareAuthState = masError;
			}
			break;
		case masNrAr:
			if (cmdsize == 8 && !isResponse) {
				snprintf(exp, size, "AUTH: nr ar (enc)");
				MifareAuthState = masAt;
				AuthData.nr_enc = bytes_to_num(cmd, 4);
				AuthData.ar_enc = bytes_to_num(&cmd[4], 4);
				AuthData.ar_enc_par = parity[0] << 4;
				return;
			} else {
				MifareAuthState = masError;
			}
			break;
		case masAt:
			if (cmdsize == 4 && isResponse) {
				snprintf(exp, size, "AUTH: at (enc)");
				MifareAuthState = masAuthComplete;
				AuthData.at_enc = bytes_to_num(cmd, 4);
				AuthData.at_enc_par = parity[0];
				return;
			} else {
				MifareAuthState = masError;
			}
			break;
		default:
			break;
	}
	
	if (!isResponse && ((MifareAuthState == masNone) || (MifareAuthState == masError)))
		annotateIso14443a(exp, size, cmd, cmdsize);
	
}

bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, uint8_t *parity, bool isResponse, uint8_t *mfData, size_t *mfDataLen) {
	static struct Crypto1State *traceCrypto1;	
	static uint64_t mfLastKey;
	
	*mfDataLen = 0;
	
	if (MifareAuthState == masAuthComplete) {
		if (traceCrypto1) {
			crypto1_destroy(traceCrypto1);
			traceCrypto1 = NULL;
		}

		MifareAuthState = masFirstData;
		return false;
	}
	
	if (cmdsize > 32)
		return false;
	
	if (MifareAuthState == masFirstData) {
		if (AuthData.first_auth) {
			AuthData.ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
			AuthData.ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);

			mfLastKey = GetCrypto1ProbableKey(&AuthData);
			PrintAndLogEx(NORMAL, "            |            |  *  |%49s %012"PRIx64" prng %s |     |", 
				"key", 
				mfLastKey,
				validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD");
			
			AuthData.first_auth = false;

			traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
		} else {
			if (traceCrypto1) {
				crypto1_destroy(traceCrypto1);
				traceCrypto1 = NULL;
			}

			// check last used key
			if (mfLastKey) {
				if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize, parity)) {
					PrintAndLogEx(NORMAL, "            |            |  *  |%60s %012"PRIx64"|     |", "last used key", mfLastKey);
					traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
				};
			}
			
			// check default keys
			if (!traceCrypto1) {
				for (int i = 0; i < MIFARE_DEFAULTKEYS_SIZE; i++){
					if (NestedCheckKey(g_mifare_default_keys[i], &AuthData, cmd, cmdsize, parity)) {
						PrintAndLogEx(NORMAL, "            |            |  *  |%61s %012"PRIx64"|     |", "key", g_mifare_default_keys[i]);

						mfLastKey = g_mifare_default_keys[i];
						traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
						break;
					};
				}
			}
			
			// nested
			if (!traceCrypto1 && validate_prng_nonce(AuthData.nt)) {
				uint32_t ntx = prng_successor(AuthData.nt, 90); 
				for (int i = 0; i < 16383; i++) {
					ntx = prng_successor(ntx, 1);
					if (NTParityChk(&AuthData, ntx)){

						uint32_t ks2 = AuthData.ar_enc ^ prng_successor(ntx, 64);
						uint32_t ks3 = AuthData.at_enc ^ prng_successor(ntx, 96);
						struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
						memcpy(mfData, cmd, cmdsize);
						mf_crypto1_decrypt(pcs, mfData, cmdsize, 0);				
						crypto1_destroy(pcs);
						
						if (CheckCrypto1Parity(cmd, cmdsize, mfData, parity) && check_crc(CRC_14443_A, mfData, cmdsize)) {
							AuthData.ks2 = ks2;
							AuthData.ks3 = ks3;
							AuthData.nt = ntx;
							mfLastKey = GetCrypto1ProbableKey(&AuthData);
							PrintAndLogEx(NORMAL, "            |            |  *  | nested probable key:%012"PRIx64"      ks2:%08x ks3:%08x |     |", 
								mfLastKey,
								AuthData.ks2,
								AuthData.ks3);

							traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
							break;
						}
					}						
				}
			}
			
			//hardnested
			if (!traceCrypto1) {
				PrintAndLogEx(NORMAL, "hardnested not implemented. uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
				MifareAuthState = masError;

				/* TOO SLOW( needs to have more strong filter. with this filter - aprox 4 mln tests
				uint32_t t = msclock();
				uint32_t t1 = t;
				int n = 0;
				for (uint32_t i = 0; i < 0xFFFFFFFF; i++) {
					if (NTParityChk(&AuthData, i)){

						uint32_t ks2 = AuthData.ar_enc ^ prng_successor(i, 64);
						uint32_t ks3 = AuthData.at_enc ^ prng_successor(i, 96);
						struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);

						n++;

						if (!(n % 100000)) {
							PrintAndLogEx(NORMAL, "delta=%d n=%d ks2=%x ks3=%x \n", msclock() - t1 , n, ks2, ks3);
							t1 = msclock();
						}

					}
				}
				PrintAndLogEx(NORMAL, "delta=%d n=%d\n", msclock() - t, n);
				*/
			}
		}
		MifareAuthState = masData;
	}
	
	if (MifareAuthState == masData && traceCrypto1) {
		memcpy(mfData, cmd, cmdsize);
		mf_crypto1_decrypt(traceCrypto1, mfData, cmdsize, 0);
		*mfDataLen = cmdsize;
	}
	
	return *mfDataLen > 0;
}

bool NTParityChk(TAuthData *ad, uint32_t ntx) {
	if (
		(oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((ad->nt_enc_par >> 5) & 0x01) ^ (ad->nt_enc & 0x01)) ||
		(oddparity8(ntx >> 16 & 0xff) ^ (ntx >> 8 & 0x01) ^ ((ad->nt_enc_par >> 6) & 0x01) ^ (ad->nt_enc >> 8 & 0x01)) ||
		(oddparity8(ntx >> 24 & 0xff) ^ (ntx >> 16 & 0x01) ^ ((ad->nt_enc_par >> 7) & 0x01) ^ (ad->nt_enc >> 16 & 0x01))
		)
		return false;
	
	uint32_t ar = prng_successor(ntx, 64);
	if (
		(oddparity8(ar >> 8 & 0xff) ^ (ar & 0x01) ^ ((ad->ar_enc_par >> 5) & 0x01) ^ (ad->ar_enc & 0x01)) ||
		(oddparity8(ar >> 16 & 0xff) ^ (ar >> 8 & 0x01) ^ ((ad->ar_enc_par >> 6) & 0x01) ^ (ad->ar_enc >> 8 & 0x01)) ||
		(oddparity8(ar >> 24 & 0xff) ^ (ar >> 16 & 0x01) ^ ((ad->ar_enc_par >> 7) & 0x01) ^ (ad->ar_enc >> 16 & 0x01))
		)
		return false;

	uint32_t at = prng_successor(ntx, 96);
	if (
		(oddparity8(ar & 0xff) ^ (at >> 24 & 0x01) ^ ((ad->ar_enc_par >> 4) & 0x01) ^ (ad->at_enc >> 24 & 0x01)) ||
		(oddparity8(at >> 8 & 0xff) ^ (at & 0x01) ^ ((ad->at_enc_par >> 5) & 0x01) ^ (ad->at_enc & 0x01)) ||
		(oddparity8(at >> 16 & 0xff) ^ (at >> 8 & 0x01) ^ ((ad->at_enc_par >> 6) & 0x01) ^ (ad->at_enc >> 8 & 0x01)) ||
		(oddparity8(at >> 24 & 0xff) ^ (at >> 16 & 0x01) ^ ((ad->at_enc_par >> 7) & 0x01) ^ (ad->at_enc >> 16 & 0x01))
		)
		return false;
		
	return true;
}

bool NestedCheckKey(uint64_t key, TAuthData *ad, uint8_t *cmd, uint8_t cmdsize, uint8_t *parity) {
	uint8_t buf[32] = {0};
	struct Crypto1State *pcs;
	
	AuthData.ks2 = 0;
	AuthData.ks3 = 0;

	pcs = crypto1_create(key);
	uint32_t nt1 = crypto1_word(pcs, ad->nt_enc ^ ad->uid, 1) ^ ad->nt_enc;
	uint32_t ar = prng_successor(nt1, 64);
	uint32_t at = prng_successor(nt1, 96);

	crypto1_word(pcs, ad->nr_enc, 1);
//	uint32_t nr1 = crypto1_word(pcs, ad->nr_enc, 1) ^ ad->nr_enc;  // if needs deciphered nr
	uint32_t ar1 = crypto1_word(pcs, 0, 0) ^ ad->ar_enc;
	uint32_t at1 = crypto1_word(pcs, 0, 0) ^ ad->at_enc;

	if (!(ar == ar1 && at == at1 && NTParityChk(ad, nt1))) {
		crypto1_destroy(pcs);
		return false;
	}

	memcpy(buf, cmd, cmdsize);
	mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
	crypto1_destroy(pcs);
	
	if (!CheckCrypto1Parity(cmd, cmdsize, buf, parity))
		return false;

	if (!check_crc(CRC_14443_A, buf, cmdsize)) 
		return false;
	
	AuthData.nt = nt1;
	AuthData.ks2 = AuthData.ar_enc ^ ar;
	AuthData.ks3 = AuthData.at_enc ^ at;
	return true;
}

bool CheckCrypto1Parity(uint8_t *cmd_enc, uint8_t cmdsize, uint8_t *cmd, uint8_t *parity_enc) {
	for (int i = 0; i < cmdsize - 1; i++) {
		if (oddparity8(cmd[i]) ^ (cmd[i + 1] & 0x01) ^ ((parity_enc[i / 8] >> (7 - i % 8)) & 0x01) ^ (cmd_enc[i + 1] & 0x01))
			return false;
	}
	return true;
}

// Another implementation of mfkey64 attack,  more "valid" than "probable"
// 
uint64_t GetCrypto1ProbableKey(TAuthData *ad) {
	struct Crypto1State *revstate = lfsr_recovery64(ad->ks2, ad->ks3);
	lfsr_rollback_word(revstate, 0, 0);
	lfsr_rollback_word(revstate, 0, 0);
	lfsr_rollback_word(revstate, ad->nr_enc, 1);
	lfsr_rollback_word(revstate, ad->uid ^ ad->nt, 0);
	uint64_t key = 0;
	crypto1_get_lfsr(revstate, &key);
	crypto1_destroy(revstate);
	return key;
}